Actually it was one, I changed that, and got better Performance by Reduce, because my Reduce-Algortihm is a little bit complex.
thanks anyway Regards, Baran 2011/5/2 Richard Nadeau <[email protected]> > I would change "mapred.tasktracker.reduce.tasks.maximum" to one. With your > setting > > On May 2, 2011 8:48 AM, "baran cakici" <[email protected]> wrote: > > without job; > > > > CPU Usage = 0% > > Memory = 585 MB (2GB Ram) > > > > Baran > > 2011/5/2 baran cakici <[email protected]> > > > >> CPU Usage = 95-100% > >> Memory = 650-850 MB (2GB Ram) > >> > >> Baran > >> > >> > >> 2011/5/2 James Seigel <[email protected]> > >> > >>> If you have windows and cygwin you probably don't have a lot if memory > >>> left at 2 gig. > >>> > >>> Pull up system monitor on the data nodes and check for free memory > >>> when you have you jobs running. I bet it is quite low. > >>> > >>> I am not a windows guy so I can't take you much farther. > >>> > >>> James > >>> > >>> Sent from my mobile. Please excuse the typos. > >>> > >>> On 2011-05-02, at 8:32 AM, baran cakici <[email protected]> wrote: > >>> > >>> > yes, I am running under cygwin on my datanodes too. OS of Datanodes > are > >>> > Windows as well. > >>> > > >>> > What can I do exactly for a better Performance. I changed > >>> > mapred.child.java.opts to default value.How can I solve this > "swapping" > >>> > problem? > >>> > > >>> > PS: I dont have a chance to get Slaves(Celeron 2GHz) with Liniux OS. > >>> > > >>> > thanks, both of you > >>> > > >>> > Regards, > >>> > > >>> > Baran > >>> > 2011/5/2 Richard Nadeau <[email protected]> > >>> > > >>> >> Are you running under cygwin on your data nodes as well? That is > >>> certain to > >>> >> cause performance problems. As James suggested, swapping to disk is > >>> going > >>> >> to > >>> >> be a killer, running on Windows with Celeron processors only > compounds > >>> the > >>> >> problem. The Celeron processor is also sub-optimal for CPU intensive > >>> tasks > >>> >> > >>> >> Rick > >>> >> > >>> >> On Apr 28, 2011 9:22 AM, "baran cakici" <[email protected]> > wrote: > >>> >>> Hi Everyone, > >>> >>> > >>> >>> I have a Cluster with one Master(JobTracker and NameNode - Intel > >>> Core2Duo > >>> >> 2 > >>> >>> GB Ram) and four Slaves(Datanode and Tasktracker - Celeron 2 GB > Ram). > >>> My > >>> >>> Inputdata are between 2GB-10GB and I read Inputdata in MapReduce > line > >>> by > >>> >>> line. Now, I try to accelerate my System(Benchmark), but I'm not > sure, > >>> if > >>> >> my > >>> >>> Configuration is correctly. Can you please just look, if it is ok? > >>> >>> > >>> >>> -mapred-site.xml > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.job.tracker</name> > >>> >>> <value>apple:9001</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.child.java.opts</name> > >>> >>> <value>-Xmx512m -server</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.job.tracker.handler.count</name> > >>> >>> <value>2</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.local.dir</name> > >>> >>> > >>> >> > >>> > <value>/cygwin/usr/local/hadoop-datastore/hadoop-Baran/mapred/local</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.map.tasks</name> > >>> >>> <value>1</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.reduce.tasks</name> > >>> >>> <value>4</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.submit.replication</name> > >>> >>> <value>2</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.system.dir</name> > >>> >>> > >>> >> > >>> >> > >>> > > <value>/cygwin/usr/local/hadoop-datastore/hadoop-Baran/mapred/system</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.tasktracker.indexcache.mb</name> > >>> >>> <value>10</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.tasktracker.map.tasks.maximum</name> > >>> >>> <value>1</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.tasktracker.reduce.tasks.maximum</name> > >>> >>> <value>4</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.temp.dir</name> > >>> >>> > >>> >> > >>> > <value>/cygwin/usr/local/hadoop-datastore/hadoop-Baran/mapred/temp</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>webinterface.private.actions</name> > >>> >>> <value>true</value> > >>> >>> </property> > >>> >>> > >>> >>> <property> > >>> >>> <name>mapred.reduce.slowstart.completed.maps</name> > >>> >>> <value>0.01</value> > >>> >>> </property> > >>> >>> > >>> >>> -hdfs-site.xml > >>> >>> > >>> >>> <property> > >>> >>> <name>dfs.block.size</name> > >>> >>> <value>268435456</value> > >>> >>> </property> > >>> >>> PS: I extended dfs.block.size, because I won 50% better performance > >>> with > >>> >>> this change. > >>> >>> > >>> >>> I am waiting for your comments... > >>> >>> > >>> >>> Regards, > >>> >>> > >>> >>> Baran > >>> >> > >>> > >> > >> >
